I meant D4 instead of A4

If you were fit for the club by a professional, it might not be the setting; something else may have crept in. It could be anything from ball position, address position etc.You should have gotten a Sure-Fit guide and a Titleist proprietary wrench to change the settings when you bought the club.Assuming nothing in your address position has changed, you might want to experiment with loft and lie angles to see what setting is best for you.If you're going left, you may want to adjust the lie angle to a flatter setting.Generally speaking if the lie angle is too upright the ball may drift left; too flat it may drift right.

Hope this helps.

At standard loft for Titleist they are 0.5* open. Every increment where you increase loft closes it by 1 degree and every increment where you decrease loft opens it by 1*. So for that 8* if you go to 8.75* it's 0.5* closed and at 9.5* it'd be 1.5* closed. If you go down to 7.25* it'd be 1.5* open.

When you adjust the loft you either get that adjusted loft OR the adjusted face angle, not both. If you adjust a 9-degree driver to 8 degrees, it's only 8 degrees IF you sole it with the face square to the target. If you let it sole as it may want to (1-degree open), the loft remains 9 degrees. This explains it well:
www.youtube.com/watch

Hi, if your are right hand and you have a 8 deg. At D1 it is a 7. 25 deg. And at D4 it is adding ,75 deg plus 8=8,75 of loft.
If you like the 8,75 loft, the only way to reduce the closed face is to put it at C4, which is the same loft but face is less closed but will still closed.
Why the face open or close? Answer is: when the driver rest on the ground, it is the contact with the sole that is turning the club.
This is true when you put the sole on the ground before gripping the club.
A trick is never ground the sole of the club. You grip the club so it is square if you want it square or open if you want it open but do no touch the ground and make your swing at the ball.
I hope this is clear and could help,
Best regards,